Torque during braking
Torque during braking
(OP)
There's a turbine spinning at 30RPM, with 18,200Nm torque. This is normal for this turbine. There's a gearbox leading to a generator. The input from the turbine into the gearbox is where the brake is positioned. It takes 4 seconds for the brake to stop the turbine. My questions is, what is happening to that 18,200Nm of torque whilst the system is braking? Is there just a linear reduction in torque as the brake applies force?
Thanks for your help.
Thanks for your help.





RE: Torque during braking
RE: Torque during braking
RE: Torque during braking
Quando Omni Flunkus Moritati
RE: Torque during braking
The turbine produces torque, that may be a function of RPM and fluid properties.
The brake produces an opposing torque.
Typically turbines are connected to generators, and the generator produces an opposing torque.
If the turbine torque is greater than or equal to the sum of the opposing torques the turbine keeps spinning.
When the sum of the opposing torque exceeds the turbine torque the turbine slows down.
RE: Torque during braking
The turbine brake must be able to provide sufficient absorption capability to overcome the combination of shaft torque produced by air/water flow over the blades plus the inertia of the rotating masses (blades, hub, bearings, gears, shafts, etc) within a specified period of time. Once the turbine drivetrain has come to a stop the brake system must only provide sufficient force to prevent any further shaft rotation. Wind turbine drivetrain brakes are normally located between the gearbox output and the generator input, which is a high speed, low torque shaft.
Turbine drivetrain brakes are usually designed to be operationally fail-safe and with very conservative margins, since a runaway turbine can result in a catastrophic failure.
RE: Torque during braking
what the torque does could stay the same or change depending on the energy going into the device to create the toque in the first place. If you remove that energy, then torque could fall to zero.
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